A project won't open (crashes Audacity immediately)

I assume you are running 3.1.1. If not, please ignore this post. :smiley:

Your kernel crash specific to one project on Audacity 3.1.1 sounds eerily similar to this issue: Re: Audacity 3.1.1 keeps crashing when trying to open file [SOLVED]

If this is the case the problem can be resolved by returning to Audacity 3.1.0 or by using the fix posted there.